On addition of conc. H2SO4 to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes come out. This is because
(i) H2SO4 reduces HI to I2
(ii) HI is of violet colour
(iii) HI gets oxidised to I2
(iv) HI changes to HI2O3
On addition of conc. H2SO4 to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes come out. This is because
(i) H2SO4 reduces HI to I2
(ii) HI is of violet colour
(iii) HI gets oxidised to I2
(iv) HI changes to HI2O3
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1 Answer
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This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (iii)
Hydrogen iodide is a more powerful reducing agent than sulphuric acid, it reduces the amount of iodine in the solution from H2SO4 to SO2 and HI to I2
When chloride salts are treated with sulfuric acid, HCl gas is formed, which produces a colourless gas.
NaCl + H2SO4→HCl + Na2SO4
Violet fumes are produced during the reaction due to the creation of iodine (I2) gas.
2NaI + H2SO4→Na2SO4 + 2HI
2H2O + SO2 + I2
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